On Wednesday, British Prime Minister Theresa May's government suffered a defeat as members of her own party sided with the opposition, backing an amendment that gives parliament a decisive vote on the final Brexit deal.

Businesswoman and transparency advocate Gina Miller has been keeping a close eye on the process — despite being subject to death threats.

I still think we have a huge lack of honesty and transparency and reasonableness about Brexit- Gina Miller

Last year, Miller took the U.K. government to court, arguing that parliament needed to vote on the process of leaving the European Union — that the government could not trigger Brexit negotiations without the approval of MPs.

Financial entrepreneur Gina Miller, one of the claimants who challenged plans for Brexit, leaves the High Court in London, Nov. 3, 2016. (Tim Ireland/AP)

"I still think we have a huge lack of honesty and transparency and reasonableness about Brexit," Miller tells The Current's Anna Maria Tremonti.

Miller has been accused of being a wealthy elitist who wants to overturn the will of the people, but she says she is not campaigning for Britain to stay in the European Union. She says she simply wants the government to be honest about what Brexit will bring.

"People have been overpromised that by leaving the EU, many things that are wrong in our society will be healed," says Miller, who is a founding partner of SCM Direct Wealth Management.

"That is not the case. The politicians are not addressing the underlying issues."

British Prime Minister Theresa May walks out at 10 Downing Street to meet European Council President Donald Tusk in London, Tuesday, Sept. 26, 2017. (Frank Augstein/Associated Press)

Miller, who immigrated to the U.K. from Guyana as a child, has suffered vicious — and often racist — attacks for expressing her views.

Rhodri Philipps, the 4th Viscount St Davids, was sentenced to 12 weeks in jail for writing a post on Facebook about Miller that said "£5,000 for the first person to 'accidentally' run over this bloody troublesome first generation immigrant. This f***ing boat jumper comes to our country, then believes she knows better than the people of our country, what is best for us. If this is what we should expect from immigrants send them back to their stinking jungles."

"The voices who are looking to divide our society and to blame others for everything, basically, feel that they can threaten me, my family, do me harm, because of the colour of my skin," she says.